monday, president obama warned syria not to use its chemical arsenal. we will stay on top of this developing story on this thursday morning. >> the u.s. made it very clear any use of chemical weapons by the assad regime would be a red line for the country we would, unlike up until now, invoke military action to solve the situation, rebels getting close to damascus, a precarious situation, any use of chemical weapons would spawn deeper u.s. intervention. so something military families may want to keep an eye on as that develops. >> 100 people dying a day since the weekend. >> in damascus there. >>> also, major developments in the case of a missing leukemia patient. >> last seen on a hospital security video more than a week ago. now her father claims she is in mexico. abc's brandi hitt joins us from los angeles with the latest twist on this strange story. brandi. >> reporter: good morning, rob, paula. at first emily's father denied knowing where his daughter was. now he says his family had good reason to move her from the hospital early. after a week-long